<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* body {
            display: flex;
            min-height: 100vh;
            margin: 0;
        }

        .main {
            margin: auto;
            background-color: orangered;
        } */
        
    </style>
</head>

<body>
    <div class="main">
        main {
        margin: auto;
        background-color: orangered;
        }
    </div>
</body>

</html>